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642-889 - Implementing Cisco Service Provider Next(R) Generation Edge Network Services - Real Exam Questions

Vendor Name Cisco
Exam Code 642-889
Exam Name Implementing Cisco Service Provider Next(R) Generation Edge Network Services
Questions and Answers 126 Q & A
Updated On December 11, 2017
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642-889 Demo and Sample

Note: Answers are below each question.
Samples are taken from full version.

642-889

Answer: B


QUESTION: 113 DRAG DROP


image


Answer:

Exhibit


image


QUESTION: 114

What are the two AToM interworking modes? (Choose two.)


  1. bridged (interworking ethernet)

  2. routed (interworking ip)

  3. label-switched (interworking mpls)

  4. transparent (interworking transparent)


Answer: A, B


Explanation:

http://www.cisco.com/en/US/docs/ios/ios_xe/mpls/configuration/guide/mp_l2vpn_intrntwkg

_ xe.html

Interworking is a transforming function that is required to interconnect two heterogeneous attachment circuits (ACs). Several types of interworking functions exist. The function that is used would depend on the type of ACs being used, the type of data being carried, and the level of functionality required. The two main Layer 2 Virtual Private Network (L2VPN) interworking functions supported in Cisco IOS XE software are bridged and routed interworking.

Layer 2 (L2) transport over multiprotocol label switching (MPLS) and IP already exists for like-to-like ACs, such as Ethernet-to-Ethernet or Point-to-Point Protocol (PPP)-to-PPP. L2VPN Interworking builds on this functionality by allowing disparate ACs to be connected. An interworking function facilitates the translation between different L2 encapsulations.


QUESTION: 115

ACisco IOS XR router is acting as a PE and is running EIGRP as the CE-PE routing protocol. SOO must be configured. Under which subconfiguration mode should SOO be configured?


  1. RP/0/0/CPU0:XR1(config-eigrp)

  2. RP/0/0/CPU0:XR1(config-eigrp-vrf-af-if)

  3. RP/0/0/CPU0:XR1(config-eigrp-vrf)

  4. RP/0/0/CPU0:XR1(config-eigrp-vrf-af)


Answer: B


QUESTION: 116

Refer to the exhibit.


image


A customer wants to deploy an IPv6 VPN network over the MPLS provider.Which option describes what must be enabled on the MPLS provider to support this request?


  1. IPv6 should be deployed inside the core network of the provider.

  2. LDP also should be configured to provide labels for IPv6 routes.

  3. MP-iBGP VPNv6 session should be configured with current IPv4 addresses.

  4. MP-iBGP IPv6 session should be configured with current IPv4 addresses.


Answer: C


QUESTION: 117

Which two statements regarding Cisco 6PE operations are correct? (Choose two.)


  1. The top label in the label stack is assigned by MP-BGP, and it is used to reach the egress PE.

  2. The inner label in the label stack is assigned by MP-BGP, and it is used for IPv6

    forwarding at the egress PE.

  3. The top label in the label stack is assigned by LDP, and it is used to reach the egress PE.

  4. The inner label in the label stack is assigned by LDP, and it is used for IPv6 forwarding at the egress PE.


Answer: B, C


Explanation: http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6553/prod_presentation090 0aecd80311df4.pdf


QUESTION: 118

In Layer 3 MPLS VPN implementations, which protocol is used to carry the VPNv4 routes from PE to PE?


  1. RSVP

  2. IGP

  3. MP-BGP

  4. LDP


Answer: C


QUESTION: 119

Which VPN technology is an example of a full-mesh VPN?


  1. VTI

  2. GRE VPN

  3. Frame Relay L2 VPN

  4. MPLS L3VPN


Answer: D


QUESTION: 120

The Cisco IOS XR address-family ipv4 labeled-unicast and the Cisco IOS/IOS XE neighbor send-label commands are used in which MPLS implementation?


  1. Cisco MPLS TE

  2. CSC using MP-BGP for label exchange

  3. back-to-back VRF

  4. AToM

  5. VPLS


Answer: B


Explanation:

http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/fscscleb.pdf

The MPLS VPN—Carrier Supporting Carrier—IPv4 BGP Label Distribution feature lets you configure your carrier-supporting-carrier network to enable Border Gateway Protocol (BGP) to transport routes and Multiprotocol Label Switching (MPLS) labels between the backbone carrier provider edge (PE) routers and the customer carrier customer edge (CE) routers using multiple paths. Previously, you had to use Label Distribution Protocol (LDP) to carry the labels and an Internal Gateway Protocol (IGP) to carry the routes between PE and CE routers to achieve the same goal.

The benefits of using BGP to distribute IPv4 routes and MPLS label routes are:

  • BGP takes the place of an IGP and LDP in a Virtual Private Network (VPN) forwarding/routing instance (VRF) table. You can use BGP to distribute routes and MPLS labels. Using a single protocol instead of two simplifies the configuration and troubleshooting.

  • BGP is the preferred routing protocol for connecting two Internet service providers (ISPs), mainly because of its routing policies and ability to scale. ISPs commonly use BGP between two providers.

This feature enables those ISPs to use BGP.


QUESTION: 121

Which organization provides and promotes a standards-based description of service provider services offering?


  1. MEF

  2. IETF

  3. IEEE

  4. ITU


Answer: A


QUESTION: 122

When implementing a Layer 2 transport subinterface on a Cisco IOS XR router, which encapsulation option is used to match any packets that are not matched by any other service instances?


  1. default

  2. untagged

  3. any

  4. tag


Answer: A


QUESTION: 123

A network engineer working for a very large financial institution must migrate the legacy Frame Relay and ATM virtual circuits over a MPLS VPN solution. Which option is a benefit in choosing a MPLS Layer 3 VPN versus any other Layer 2 VPN design?


  1. An MPLS Layer 3 VPN design offers better scalability for large organizations.

  2. An MPLS Layer 3 VPN design requires less customer edge router configuration than any other Layer 2 VPN implementation.

  3. An MPLS Layer 3 VPN solution provides the possibility to implement overlapping IP addressing.

  4. An MPLS Layer 3 VPN design requires less provider edge router configuration than any other Layer 2 VPN implementation.


Answer: A


QUESTION: 124

A customer has two sites over an MPLS cloud with Ethernet connections and requires one STP domain to be transparent over the MPLS provider. Which label-switching technology can the provider use without getting involved in learning the customer MAC addresses?


  1. L2TPV3

  2. EoMPLS

  3. VPLS

  4. H-VPLS


Answer: B


QUESTION: 125

Exhibit


image


image


image


On PE7, which encapsulation method is used on the pseudowire that connects to the

10.8.1.1 neighbor?


  1. MPLS

  2. L2TPv3

  3. IP

  4. LDP

  5. Ethernet


Answer: B


Explanation:

show xconnect all check value is mpls or l2tp or Ethernet etc in segment field


QUESTION: 126

Exhibit


image


image


image


Which statement is correct regarding the pseudowire on connects PE7 to the 10.8.1.1 neighbor?


  1. The control word is enabled on both ends of the pseudowire

  2. The MTU size is 1500 bytes on both ends of the pseudowire

  3. Pseudowire backup is enabled

  4. The pseudowire is in the down state


Answer: B


Explanation:

show xconnect all

show ip interfacebrief show mpls l2transport vc show cable l2-vpn xconnect mpls-vc-map

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